html,
body,
#root,
div,
p,
span,
dl,
dd,
dt,
ul,
li,
ol,
li {
  margin: 0;
  padding: 0;
  list-style: none;
  text-decoration: none;
}

body::after {
  content: "";
  /* 预加载所有可能的背景图 */
  background-image:
    url(./img//login.webp),
    url(./img/register.webp);
  /* 将这些图片移到屏幕外，不显示 */
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
  z-index: -1;
}

html,
body,
#root {
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  font-size: 16px;
}